A fuel system, a method of fueling a vehicle, and a vehicle are provided. The fuel system has a recirculation line connecting a fuel tank to a fuel fill inlet. An ejector is positioned within the recirculation line, and a valve is positioned within a drain line fluidly connecting the ejector to the fuel tank. A pressure sensor is positioned to measure a pressure associated with the drain line between the ejector and the valve. A controller is in communication with the pressure sensor, and the controller configured to, in response to initiation of a refueling event, determine a state of the valve based on the pressure.
Legal claims defining the scope of protection, as filed with the USPTO.
3. The fuel system of claim 2 wherein the entry condition is met when the first pressure is substantially equal to the second pressure after a key-off event.
4. The fuel system of claim 2 wherein the controller is further configured to set a flag associated with the ejector in response to the entry condition not being met after a key-off event.
6. The fuel system of claim 1 wherein the controller is further configured to determine the state of the valve in response to a fuel fill rate being greater than a threshold.
8. The fuel system of claim 6 wherein the controller is further configured to receive a signal indicative of a fuel fill rate for another vehicle at a filling station.
9. The fuel system of claim 1 wherein the controller is further configured to set a flag associated with the valve in response to the pressure being less than an atmospheric pressure.
10. The fuel system of claim 1 further comprising an evaporative emissions system fluidly connected to the recirculation line between the ejector and the second end, the evaporative emissions system including a fuel vapor canister positioned to receive fuel vapor from the fuel tank via the second end of the recirculation line, the evaporative emissions system having a first valve fluidly coupling the recirculation line to the canister via a first conduit, and a second valve fluidly coupling the recirculation line to the canister via a second conduit, the second conduit in parallel to the first conduit.
11. The fuel system of claim 10 wherein the controller is further configured to control the first valve to a closed position in response to the refueling event, and prior to determining the state of the valve.
12. The fuel system of claim 11 wherein the controller is further configured to pulse the second valve in response to the refueling event and while determining the state of the valve.
13. The fuel system of claim 12 wherein the controller is further configured to set a flag associated with the valve in response to the pressure being less than an atmospheric pressure prior to the second valve being pulsed.
14. The fuel system of claim 12 wherein the controller is further configured to set a flag associated with the valve and an outlet of the ejector in response to the pressure being greater than an atmospheric pressure subsequent to the second valve being pulsed.
15. The fuel system of claim 12 wherein the controller is further configured to open the first valve subsequent to determining the state of the valve.
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October 19, 2021
December 6, 2022
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